Upgrade JUnit Jupiter 5.9.0 -> 5.9.1 (#252)

See:
- https://junit.org/junit5/docs/current/release-notes/index.html
- https://github.com/junit-team/junit5/releases/tag/r5.9.1
- junit-team/junit5@r5.9.0...r5.9.1

pom.xml

@@ -389,7 +389,7 @@
             <dependency>
                 <groupId>org.junit</groupId>
                 <artifactId>junit-bom</artifactId>
-                <version>5.9.0</version>
+                <version>5.9.1</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>